In this work the simulation is presented by means of the method Monte Cario Utilizing the code FOTELP, simulating a 60Co of therapy for the purpose of obtaining dose percentage curves in depth (PDD), for a seze of field of lOxlO cm2, for such motive I am built the virtual headrest ofthe cobalt and for the deposition ofthe dose of water I am built a fantoma virtual with dimensions of 30x30x30 cm3 • Said results were compared with theoretical data, being obtained thus an acceptable result.

Polyvinyl alcohol (PVA) nanofibers reinforced with multi-walled carbon nanotubes (MWCNTs) were fabricated by electrospinning. MWCNTs were introduced into the PVA matrix through the application of an electric field. The morphology of the composite MWCNTs/PVA fibers was characterized by scanning electron microscopy. Results show that the nanofibers had a diameter between 48 and 103 nm and contained a variable amount of MWCNTs. The electrical properties of MWCNTs/PVA nanofibers were investigated by fabricating impedance-type sensors. The impedance and electrical conductivity of the samples were evaluated in the range 46% and 89% relative humidity.

In this work, well-designed zinc oxide-reduced graphene oxide (ZnO-rGO) nanorods (NRs) were synthesized by a hydrothermal method using electrospun ZnO-rGO seed layers. The ZnO-rGO seed layers were fabricated on fluorine-doped tin oxide (FTO) glass substrates through calcined of electrospun nanofibers at 400◦C in the air for 1 h. The nanofibers were prepared by electrospinning different spinning voltages and a spinning solution containing zinc acetate, polyvinyl pyrrolidone, and 0.2 wt% rGO. From a detailed characterization using various analytical techniques, for instance, X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), Raman spectroscopy, photoluminescence (PL), and X-ray photoelectron spectroscopy (XPS), the dependence of the structure, morphology, and optical properties of the ZnO-rGO NRs was demonstrated. The photocatalytic activities of ZnO-rGO nanorods...

This work was supported by the Projects Nº 133-FINCYT-IB-2015 and Nº 113-INNOVATE PERU-ISASS-2018, P. R. would like to thank the Peruvian Council for Science and Technology (CONCYTEC) for the Scholarship.

One-dimensional nanostructures have shown high photocatalytic efficiency due to their high surface area to volume ratio and charge transfer efficiency. In this work, we have studied the influence of zinc acetate content (zinc acetate to polyvinyl alcohol (PVA) mass ratio) on the photoelectrochemical performance of zinc oxide (ZnO) nanostructures. The nanostructures of ZnO were fabricated on fluorine-doped tin oxide glass substrate by electrospinning of aqueous solution containing different amounts of zinc acetate. The precursor nanofibers of zinc acetate/PVA were converted into polycrystalline ZnO nanostructures with hexagonal wurtzite crystal structure by calcination at 600°C for 3 h. It was found that by increasing the amount of zinc acetate, the diameter of the as-spun precursor fibers increased and their distribution became broader. The mean diameter of the ZnO nanoparticles forming...

We report two cases of cervical pregnancy with desire of childbearing capacity preservation. Both patients were sucessfully treated with 50 mg-m2 single dose methotrexate therapy, free of complications.

We report two cases of cervical pregnancy with desire of childbearing capacity preservation. Both patients were sucessfully treated with 50 mg-m2 single dose methotrexate therapy, free of complications.

The cases of two patients with cervical ectopic pregnancy with fertility desire depreservación treated with methotrexate (MYX) single dose -50 mg / m2 is presented. The findings as well as treatment and evolution is discussed.

The cases of two patients with cervical ectopic pregnancy with fertility desire depreservación treated with methotrexate (MYX) single dose -50 mg / m2 is presented. The findings as well as treatment and evolution is discussed.

The objective of the study was to determine the bromatological composition of the ammonification of oats hay subjected to four levels of urea and three of water. A completely randomized design was used with four repetitions in a 4x3 factorial scheme. The levels of urea (2, 4, 6%, based on dry matter) and water (20, 30, 40%) added were evaluated. The processed oats were stored in PVC microsilos of 10x60 cm for 60 days. At the opening of the silos, samples were collected to determine DM, CP, mineral matter (MM), NDF and ADF, plus hemicellulose by the difference between the latter components. The DM decreased linearly when using the water levels with 2, 4 and 6% urea. The average CP content increased cubically with the addition of urea (14.52%) in relation to urea-free silage (6.70%) and decreased with water levels (11.89 vs. 9.92%). There was no effect of the urea or water levels on the co...

El objetivo del estudio fue determinar la composición bromatológica de la amonificación del heno de avena sometido a cuatro niveles de urea y tres de agua. Se utilizó un diseño completamente al azar con cuatro repeticiones en esquema factorial de 4x3. Se evaluaron los niveles de urea (2, 4, 6%, en base a materia seca) y de agua (20, 30, 40%) adicionada. La avena tratada fue almacenada en microsilos de tubos de PVC de 10x60 cm durante 60 días. A la apertura de los silos se colectaron muestras para determinar MS, PC, materia mineral (MM), FDN y FDA, y por diferencia entre estos últimos se determinó la hemicelulosa. La MS disminuyó linealmente al utilizar los niveles de agua con 2, 4 y 6% de urea. El contenido medio de PC aumentó de forma cúbica con la adición de urea (14.52%) con relación al ensilado libre de urea (6.70%) y disminuyó con los niveles de agua (11.89 vs. 9.92%)....

Se evaluó el semen de toros Holstein y Brown Swiss con el objetivo de determinar la viabilidad mediante la motilidad espermática en función del tiempo post descongelado utilizando el test de termorresistencia (TT). Se emplearon cuatro sementales (2/raza) para evaluar: motilidad espermática progresiva (MP), rápida (MR), lenta (ML) y circular (MC) en diferentes tiempos post descongelado; también se determinó el porcentaje de espermatozoides vivos. Para MP se encontró diferencias significativas (p<0.05) entre razas (Holstein>Brown Swiss) y entre momentos post descongelado, a partir de los 30 minutos la motilidad desciende (P<0.05) conforme se incrementa el tiempo desde el descongelado; comportamiento similar se vio para MR. La ML mostró diferencia entre razas (p<0.05), pero desapareció en tiempo post descongelado (p>0.05). La MC fue diferente entre razas, Holstein s...